Setting SimulationInputOverride value to None, leads to unexpected error

[MortGron]

System information (please complete the following information):

• OS: Windows
• Python Version: 3.12
• SDK Version: 8.18

Describe the bug
Setting value to None in SimulationInputOverride when running a simulation leads to an unexpected error. Instead of the API error correctly being raised, an unclear error is raised:

Fundamentally, it seems if a Cognite data class method _load does more data validation than __init__, this problem might occur.

To Reproduce
Runnable code reproducing the error.

client.simulators.runs.create(SimulationRunWrite(..., inputs=[SimulationInputOverride("ref_id", None)]))

Expected behavior
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Additional context
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